20 CFR § 404.310
When am I entitled to old-age benefits?
February 18, 2021
We will find you entitled to old-age benefits if you meet the following three conditions:
(a) You are at least 62 years old;
(b) You have enough social security earnings to be fully insured as defined in §§404.110 through 404.115; and
(c) You apply; or you are entitled to disability benefits up to the month you attain full retirement age (as defined in §404.409). When you attain full retirement age, your disability benefits automatically become old-age benefits.
[68 FR 4702, Jan. 30, 2003]